1. Monday, 2/8/10 SWBAT…write and graph parallel and perpendicular lines
Agenda
Parallel and perpendicular line practice with tablets
Exit slip
Warm-Up:
Grab a tablet, eraser and dry erase marker
Turn in any missing homework
Turn in take-home tests
HW:
1.) Do problems on back of agenda (review)
2.) Read and do the Graphing/ Substitution/ Elimination examples 1

2. Graph y = 3 and y = 7 on your tablet
Are these two lines parallel, perpendicular or neither?
Answer: Parallel

3. Graph x = 4 and x = 7 on your tablet
Are these two lines parallel, perpendicular or neither?
Answer: Parallel

4. y = -5/2x + 10
-5x + 2y = 20
Are these two lines parallel, perpendicular or neither?
Answer: Neither

5. Question from hw said…
Write an equation in slope-intercept form (y = mx + b) for the line that is PARALLEL to the given line and that passes through the given point. Graph BOTH LINES.
Problem #6: y = -3/4x + 4 (-2, 3)

6. Graph y = -3/4x + 4
Find the equation of the line that is parallel to y = -3/4x + 4 that passes through (-2, 3) (Show work on the back of tablet)
Graph y = -3/4x + 3/2
Do you see that both lines are parallel? (FYI: since slope is negative, line should fall when viewed from left to right)

7. Question from hw said…
Write an equation in slope-intercept form (y = mx + b) for the line that is PERPENDICULAR to the given line and that passes through the given point. Graph BOTH LINES.
Problem #14. y = -½ x (-2, 0)

8. Graph y = -1/2 x
Find the equation of the line that is perpendicular to y = -1/2x that passes through (-2, 0) (Show work on the back of tablet)
Graph y = 2x + 4
Do you see that both lines are perpendicular? (you should!)

9. OPEN ENDED
Graph a line that is parallel and a line that is perpendicular to y = 2x – 1.

10. CHALLENGE
If the line through (-2, 4) and (5, d) is parallel to the graph of y = 3x + 4, what is the value of d?

11. REASONING
Is a horizontal line perpendicular to a vertical line sometimes, always, or never? Explain your reasoning.